CN113019394B - 氨分解制氢Ni-Pt/CeO2催化剂及其制备方法和应用 - Google Patents
氨分解制氢Ni-Pt/CeO2催化剂及其制备方法和应用 Download PDFInfo
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Abstract
本发明提供了一种氨分解制氢Ni‑Pt/CeO2催化剂及其制备方法和应用,属氨分解制氢技术领域。该催化剂包括活性组分和载体,所述活性组分为Ni和Pt,载体为CeO2;采用等体积浸渍法制备,首先将Ce3+盐在350℃焙烧制得CeO2载体,然后将载体分散于氯铂酸溶液中进行浸渍,所得产物经干燥、焙烧制得Pt/CeO2,最后将Pt/CeO2分散于镍金属盐溶液中进行浸渍,所得产物经干燥、焙烧制得Ni‑Pt/CeO2双金属催化剂。与Ni/CeO2催化剂相比,本发明通过引入少量贵金属Pt制备双金属Ni‑Pt催化剂,可以显著提高其氨分解反应活性,达到较好的氨分解效果。
Description
技术领域
本发明涉及氨分解制氢技术领域,具体涉及一种氨分解制氢Ni-Pt/CeO2双金属催化剂及其制备方法和应用。
背景技术
氢气(H2)作为一种环境友好、高能高效的能源载体,有望成为未来能源体系的核心。目前氢气制取的主流工艺有两种,一种是碳氢化合物气化或重整,然而由于碳氢化合物中含有碳,生产过程中无法避免CO等副产物的产生;另一种是电解水制氢,电解水制氢虽然工艺流程简单,安全无污染,但是耗电量非常大,能耗高。NH3分解制氢(2NH3(g) → 3H2(g)+ N2(g) ΔH0 = 46.1 kJ/mol)因操作简单、成本相对较低而受到广泛关注。由于氨分解产生的氮气为化学惰性,避免了使用含碳原料生产的氢气中普遍存在的COx对电池电极的毒害作用,满足质子交换膜燃料电池(PEMFC)工作要求。因此,氨分解制氢是化学工业制取洁净氢气的一个重要反应,而其应用的关键是氨分解催化剂的开发。
中国专利文献CN1245737A公开了一种镍基氨分解制氢氮混合气催化剂,其主要活性成分为Ni和Mo;载体为MgO或Al2O3;其中镍重量百分比为0.5~16%,钼重量百分比为3~21%,载体余量。采用该催化剂可以进行氨气分解,但只有当反应温度高达650℃才有较高的氨转化率,在较低温度下的催化活性不高,氨气的分解效果欠佳,且该催化剂使用的空速仅为1800 h-1,氨气处理效率较低。
中国专利文献CN1772614A公开了一种镍基氨分解制氢氮混合气催化剂,其主要活性成分为Ni;载体为ZrO2或Al2O3;助剂为La2O3或CeO2;其中镍重量百分含量为10~70%。采用该催化剂可以进行氨气分解,且该催化剂的使用温度为550 ℃,较现有的工业催化剂工作温度800 ℃有所降低,但是当Ni的负载量高达60%时,才有较高的氨分解转化率。
目前,氨分解催化剂依然存在活性组分负载量较大,低温催化活性低,氨气处理效率低等问题。针对以上问题,本发明目的在于以CeO2为载体,通过引入Pt金属来提高Ni基氨分解反应的活性,并通过降低Ni和Pt的负载量达到节约成本的目的,从而提供一种具有高活性、金属负载量低、适用温区宽和耐热稳定性优异的氨分解催化剂制备工艺。
发明内容
本发明公开了一种用于氨分解制氢反应的Ni-Pt/CeO2催化剂,包括活性组分和载体,活性组分为Ni和Pt,载体为CeO2;以质量百分比计,金属Pt含量为0.03~1.0 wt.%,金属Ni含量为2.0~6.0 wt.%。具体制备步骤如下:
首先,将金属铈盐在空气气氛中,350℃焙烧2h制得CeO2载体;
进一步,室温下,采用等体积浸渍法,将CeO2载体加入氯铂酸溶液中进行浸渍,所得产物经80℃干燥12h、焙烧,得到Pt/CeO2;
再进一步,将Pt/CeO2加入金属镍盐溶液中进行等体积浸渍,所得产物经120 ℃干燥、一定温度焙烧制得Ni-Pt/CeO2催化剂。
优选的,所述金属铈盐选自Ce(NO3)3∙6H2O、(NH4)2Ce(NO3)6、Ce2(SO4)3·8H2O和Ce(SO4)2·4H2O中的至少一种;
优选的,所述金属镍盐选自醋酸镍、硝酸镍和氯化镍中的至少一种;
优选的,步骤(2)所述焙烧温度为700~900 ℃,焙烧时间10~14 h;
优选的,步骤(3)所述的焙烧温度为300~500℃,焙烧时间1~4 h。
应用:所述Ni-Pt/CeO2双金属催化剂用于催化氨分解制氢。
与现有技术相比,本发明的优点在于:
Ni-Pt/CeO2氨分解催化剂的活性组分为Ni和Pt,CeO2为载体,在还原性气氛中CeO2中Ce4+可转化为Ce3+,从而获得氧空位,有利于增强活性组分与CeO2载体间的相互作用,提高催化剂活性;本发明通过在制备CeO2过程添加微量的Pt,使CeO2载体的颗粒尺寸减小,经还原后CeO2表面氧空位浓度增大,从而获得更多的Ni-CeO2界面以及更强的Ni-CeO2相互作用,进而影响催化剂氨分解反应性能;同时Pt的添加,有利于显著降低Ni的负载量,达到节约成本的目的,从而提供一种具有高活性、低金属负载量、适用温区宽和耐热稳定性优异的氨分解催化剂制备工艺。
此外,微量Pt的添加,起到改性载体CeO2的作用,进而提高负载Ni催化剂的氨分解活性;随着Pt含量的增加,Ni和Pt可构成双金属活性中心,由于Ni和Pt与反应物NH3分子的键合能力不同,即Ni-N和Pt-N化学键的键能不同,将Ni和Pt进行复合有利于获得适中的金属-N化学键,有利于氨分解反应物NH3的解离和产物N2分子的脱附,提高催化剂的氨分解性能。
根据本发明Ni-Pt/CeO2催化剂的制备方法,通过将金属Pt和活性组分Ni依次浸渍到CeO2载体上,该制备方法工艺简单,操作方便,只需要一般的催化剂制备条件;且相对于负载型贵金属催化剂,该制备方法所需贵金属含量比较低,更为经济。
附图说明
图1为本发明实施例5和对比例样品的H2-TPR谱图。由图1a可见,添加微量Pt后,Pt/CeO2在360℃左右出现一个明显的还原峰,可归属为CeO2表面Ce4+还原为Ce3+并产生氧空位;由图1b可以看出,与对比例的Ni/CeO2催化剂相比,实施例5的Ni-Pt/CeO2催化剂归属于Ni 物种的还原峰(50~350℃)峰温较低,说明Ni与载体间存在更强的相互作用,更容被还原。
图2为本发明实施例5和对比例样品的XRD图谱。由图2可见,实施例5样品的CeO2衍射峰,强度较小,半峰宽较窄,说明Pt的加入有利于获得较小的CeO2晶粒尺寸。实施例5的Ni-Pt/CeO2和对比例的Ni/CeO2催化剂CeO2的晶粒尺寸分别为52.8和109.7 nm。
具体实施方式
本发明将通过以下实施例和对比例更详细地描述,但不限于这些实施例。
制备CeO2载体:
将Ce(NO3)3∙6H2O粉末在静态空气气氛中,350℃下焙烧2 h制得CeO2载体。
氯铂酸溶液:
称取0.9773g H2PtCl6∙6H2O溶于10 mL浓度为6 mol/L的浓盐酸中,制得氯铂酸溶液。
实施例1:
称取4.8 g CeO2载体,称量0.1328 g 氯铂酸溶液并用3.5 mL去离子水稀释,然后加入CeO2载体进行等体积浸渍;产物在80℃下干燥12 h后,在空气气氛中800℃下焙烧12h,制得Pt/CeO2。
称取0.7432 g Ni(NO3)2·6H2O溶于3.5 mL去离子水中,采用等体积浸渍法负载于上述Pt/CeO2上;然后在120℃下干燥2 h后,在空气气氛中400℃焙烧2 h,即得Ni-Pt/CeO2催化剂。
实施例2:
称取4.825 g CeO2载体,称量0.8460 g氯铂酸溶液并用3.5 mL去离子水稀释,然后加入CeO2载体进行等体积浸渍;产物在80℃下干燥12 h后,在空气气氛中800℃下焙烧12h,得到 Pt/CeO2。
称取0.7432 g Ni(NO3)2·6H2O溶于3.5 mL去离子水中,采用等体积浸渍法负载于上述Pt/CeO2上;然后在120℃下干燥2 h后,在空气气氛中400℃焙烧2 h,即得Ni-Pt/CeO2催化剂。
实施例3:
称取4.835 g CeO2载体,称量0.5074 g氯铂酸溶液并用3.5 mL去离子水稀释,然后加入CeO2载体进行等体积浸渍;产物在80℃下干燥12 h后,在空气气氛中800℃下焙烧12h,制得Pt/CeO2。
称取0.7432 g Ni(NO3)2·6H2O溶于3.5 mL去离子水中,采用等体积浸渍法负载于上述Pt/CeO2上;然后在120℃下干燥2 h后,在空气气氛中400℃焙烧2 h,即得Ni-Pt/CeO2催化剂。
实施例4:
称取4.845 g CeO2载体,称量0.1691g氯铂酸溶液并用3.5 mL去离子水稀释,然后加入CeO2载体进行等体积浸渍;产物在80℃下干燥12 h后,在空气气氛中800℃下焙烧12h,制得Pt/CeO2。
称取0.7432 g Ni(NO3)2·6H2O溶于3.5 mL去离子水中,采用等体积浸渍法负载于上述Pt/CeO2上;然后在120℃下干燥2 h后,在空气气氛中400℃焙烧2 h,即得Ni-Pt/CeO2催化剂。
实施例5:
称取4.8475 g CeO2载体,称量0.0846 g氯铂酸溶液并用3.5 mL去离子水稀释,然后加入CeO2载体进行等体积浸渍;产物在80℃下干燥12 h后,在空气气氛中800℃下焙烧12h,制得Pt/CeO2。
称取0.7432 g Ni(NO3)2·6H2O溶于3.5 mL去离子水中,采用等体积浸渍法负载于上述Pt/CeO2上;然后在120℃下干燥2 h后,在空气气氛中400℃焙烧2 h,即得Ni-Pt/CeO2催化剂。
实施例6:
称取4.8485 g CeO2载体,称量0.0507 g氯铂酸溶液并用3.5 mL去离子水稀释,然后加入CeO2载体进行等体积浸渍;产物在80℃下干燥12 h后,在空气气氛中800℃下焙烧12h,制得Pt/CeO2。
称取0.7432 g Ni(NO3)2·6H2O溶于3.5 mL去离子水中,采用等体积浸渍法负载于上述Pt/CeO2上;然后在120℃下干燥2 h后,在空气气氛中400℃焙烧2 h,即得Ni-Pt/CeO2催化剂。
对比例:
称取4.85 g CeO2载体在空气气氛中800℃焙烧12 h获得CeO2载体;然后称取0.7432 g Ni(NO3)2·6H2O溶于3.5 mL去离子水中,采用等体积浸渍法负载于CeO2载体中,在120℃下干燥2 h后,在空气气氛中400℃焙烧2 h,经压片成型即得Ni/CeO2催化剂。
H2程序升温还原测试在美国Micromeritics公司生产的AutoChem Ⅱ 2920型全自动化学吸附仪上进行。称取50 mg催化剂,10 vol.% H2/Ar气氛中,以10℃min-1的升温速率将催化剂从室温加热至900℃;测量前,样品经高纯Ar,300℃下吹扫30 min。
XRD测试在配备X’Celerator探测器的X’pert Pro粉末衍射仪(荷兰Panalytical公司)上进行,测试前样品经还原3 h。采用Cu Kα辐射(λ = 0.154 06 nm),工作电压45 kV,工作电流40 mA,测试范围为:2θ=20-100°。
活性测试条件:原料气为纯氨,催化剂经500℃预还原3 h。测试空速30 000 mL·g-1·h-1,测试温区为600~800℃。
催化剂的活性用NH3分解率表示,氨分解率=(初始氨含量-处理后氨含量)/初始氨含量*100%。
以NH3分解率表示催化活性,实施例及对比例的活性评价结果如下表:
表1 实施例及对比例的金属含量
表2 实施例及对比例的活性评价结果
由表2可知,本发明的Ni-Pt/CeO2催化剂在低温区有较高的氨分解率;添加微量Pt(实施例6,Pt含量0.03%)后,催化剂在低温区即可获得较高的氨分解率;进一步提高Pt含量至1.0%,由于Ni-Pt双金属的共同作用,催化剂低温氨分解活性进一步提高。
以上所述仅为本发明的较佳实施例,凡依本发明申请专利范围所做的均等变化与修饰,皆应属本发明的涵盖范围。
Claims (6)
1. 一种用于氨分解制氢Ni-Pt/CeO2双金属催化剂的制备方法,其特征在于,所述Ni-Pt/CeO2双金属催化剂包括活性组分和载体,活性组分为Ni和Pt,载体为CeO2;以质量百分比计,金属Pt含量为0.03~1.0 wt.%,金属Ni含量为2.0~6.0 wt.%;
所述的用于氨分解制氢Ni-Pt/CeO2双金属催化剂的制备方法,包括以下步骤:
(1)将金属铈盐在空气气氛中,350℃焙烧2h制得CeO2载体;
(2)室温下,采用等体积浸渍法,将CeO2载体加入氯铂酸溶液中进行浸渍,所得产物经80℃干燥12h、焙烧,得到Pt/CeO2;
(3)进一步,将Pt/CeO2加入金属镍盐溶液中进行浸渍,所得产物经120 ℃干燥、焙烧制得Ni-Pt/CeO2催化剂。
2.根据权利要求1所述的制备方法,其特征在于:所述金属铈盐为Ce(NO3)3∙6H2O、(NH4)2Ce(NO3)6、Ce2(SO4)3·8H2O和Ce(SO4)2·4H2O中的至少一种。
3.根据权利要求1所述的制备方法,其特征在于:所述金属镍盐为醋酸镍、硝酸镍和氯化镍中的至少一种。
4. 根据权利要求1所述的制备方法,其特征在于:步骤(2)所述焙烧温度为700~900℃,焙烧时间10~14 h。
5. 根据权利要求1所述的制备方法,其特征在于:步骤(3)所述的焙烧温度为300~500℃,焙烧时间1~4 h。
6.根据权利要求1–5任一项所述的制备方法制备得到的催化剂在氨分解中的应用。
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